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Solar airplane unveiled in Zurich

After six years of research and planning, Swiss adventurers Bertrand Piccard and André Borschberg will soon take to the skies with the Solar Impulse. Equipped with over 12,000 solar cells and a hefty battery pack, it is the first aircraft designed to fly both day and night without fossil fuel or pollution. Test flights for the prototype are scheduled for this year; a second version should circle the globe in 2012.